@type t() :: %LemonCliRunners.ClaudeSchema.StreamSystemMessage{
  api_key_source: String.t() | nil,
  cwd: String.t() | nil,
  mcp_servers: list() | nil,
  model: String.t() | nil,
  output_style: String.t() | nil,
  permission_mode: String.t() | nil,
  session_id: String.t() | nil,
  subtype: String.t(),
  tools: [String.t()] | nil,
  type: :system,
  uuid: String.t() | nil
}